IRF4 is required for anabolic induction of CD4+ T cells.

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IRF4 is required for anabolic induction of CD4+ T cells. IRF4 is required for anabolic induction of CD4+ T cells. (A) CD4+ T cells activated under Th1-inducing conditions were analyzed by phospho-flow cytometry for mTOR activity by ribosomal S6 phosphorylation levels at day 4 post–TCR stimulation (upper left and middle left panels). FACS plot statistic indicates mean fluorescence intensity (MFI) of phospho-S6. Quantification of phospho-S6 levels (upper middle right panel). MFI of phospho-S6 at the indicated cell divisions (upper right panel). Error bars denote SEM. Representative line graph of phospho-FoxO1 levels in WT and IRF4-KO CD4+ T cells at day 4 post–TCR stimulation (lower left panel). Quantification of phospho-FoxO1 MFI (lower right panel). (B) WT and IRF4-KO CD4+ T cells were pulse-labeled with CPD and MitoTracker Green, followed by TCR stimulation and flow cytometry analysis after 66 h of culture (upper left and middle left panels). MitoTracker fluorescence (y-axis) decreases with each cell division (x-axis) as the pulse-labeled mitochondria age and are passively apportioned, as well as actively cleared by mitophagy (hence, “mitoclearance”). Frequency statistic indicates the percentage of cells in the MitoTracker-low trapezoidal gate. Quantification of the frequency of cells in the MitoTracker-low gate (upper middle right panel). MFI of pulsed MitoTracker fluorescence at the indicated cell divisions (upper right panel). Error bars denote SEM. Representative line graph of total mitochondrial content measured by MitoTracker Red staining immediately prior to flow cytometry, at day 4 of culture (lower left panel). Quantification of MitoTracker Red MFI (lower middle left panel). Representative line graph of mitochondrial membrane potential measured by TMRE staining on day 4 of culture (lower middle right panel). Quantification of TMRE MFI (lower right panel). (C) Representative line graphs of CD4+ T cells labeled with CPD, stimulated in Th1 conditions, and analyzed by flow cytometry on day 4 of culture for forward scatter (FSC; cell size), expression of the indicated nutrient transporters (CD98 and Glut1), and glucose uptake (2-NBDG) (upper panels). Quantification of the indicated flow cytometry parameters for WT and IRF4-KO CD4+ T cells (lower panels). *p < 0.05, **p < 0.01, paired t test. n.s., not significant. Radomir Kratchmarov et al. ImmunoHorizons 2017;1:156-161 Copyright © 2017 The Authors